I use two daisy chained together off of he same maxi-jet 400 pump. One for Carbon and another for GFO. So far I've been using 250ml of rowaphos which I change monthly. According to my elos phosphate kit I'm still at 0.01 and the hair algae just keeps growing the same as it has for the past year. When I finally run out of rowaphos I'm going to try some of the more expensive Bulk Reef Supply High Capacity GFO.
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